are combination reactions a reversible change? since, on decomposing a compound , we get its constituent substances.
Some combination reactions are reversible in nature while some are not.
Complete the following:
Lavoisier, a French chemist, on the basis of quantitative studies, classified substances into elements and compounds. He showed that when mercuric oxide is heated, it changes into …………… and ………………. .
Mercuric Oxide
Mercuric oxide is a compound because it decomposes into …………………. substances. But mercury and …………….. cannot be further decomposed into simpler substances hence they are ……………… .